Hieracium horridum

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Hieracium horridum
Hieracium horridum.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Hieracium
Species:
H. horridum
Binomial name
Hieracium horridum
Fr. [1]
Range of Hieracium horrid.svg
Synonyms [1]
  • Hieracium breweriA.Gray
  • Pilosella horrida(Fr.) F.W.Schultz & Sch.Bip.

Hieracium horridum, [1] known as the prickly hawkweed [2] or shaggy hawkweed, is a species of plant in the family Asteraceae. It gets its name from the long, dense, shaggy white to brown hairs (trichomes) which cover all of the plant parts [3] of this plant species. [4] The species is native to Oregon, California, and Nevada in the western United States. [5] [6]

Contents

Name

The epithet horridum means 'bristly' in reference to its hairy leaves. [7]

Description

Hieracium horridum possesses oblong leaves along the stems of this 4 inches (10 cm) to 15 inches (38 cm) tall hairy plant with 11-12 bright yellow flower heads at the top [3] of each flower head, which is 0.315 inches (8 mm) to 0.354 inches (9 mm) in diameter. [8] It flowers between late June and August.

Like all members of the family Asteraceae, the flowers are actually florets made up of many ray corolla, each ray its own stamen. As with other plants of the tribe Cichorieae, the stems and leaves produce a milky substance when broken. [9]

Distribution

The habitat of Hieracium horridum is in dry rocky places within mountainous coniferous forests [10] in Oregon, California and Nevada [2] [4] at elevations between 5,000 feet (1,524 m) and 12,000 feet (3,658 m). [3]

References

  1. 1 2 3 "Hieracium horridum Fr". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2020-09-24.[ dead link ]
  2. 1 2 Natural Resources Conservation Service (2007). "PLANTS Profile for Hieracium horridum Fr. prickly hawkweed". The PLANTS Database. USDA, Baton Rouge, LA 70874-4490 USA. Retrieved 2007-12-26.
  3. 1 2 3 Niehaus, Theodore F. (1976). "Pacific States Wildflowers". Peterson Field Guide. The Peterson Field Guide Series. Illustrations by Charles L. Ripper. New York: Houghton Mifflin Company. p.  220. ISBN   0-395-91095-1.
  4. 1 2 "Hieracium horridum". Germplasm Resources Information Network . Agricultural Research Service, United States Department of Agriculture . Retrieved 2007-12-26.
  5. ↑ Calflora taxon report, University of California, Hieracium horridum Fries Shaggy Hawkweed, prickly hawkweed
  6. ↑ Biota of North America Program 2014 county distribution map
  7. ↑ Blackwell, Laird R. (2006). Great Basin Wildflowers: A Guide to Common Wildflowers of the High Deserts of Nevada, Utah, and Oregon (A Falcon Guide) (1st ed.). Guilford, Conn.: Morris Book Publishing, LLC. p. 124. ISBN   0-7627-3805-7. OCLC   61461560.
  8. ↑ Flora of North America. "Hieracium horridum Fries, Uppsala Univ. Årsskr. 1862". Flora of North America North of Mexico. 19, 20 and 21. New York and Oxford: Flora of North America Association: 278, 283, 292. Retrieved 2007-12-26.
  9. ↑ Mrs M. Grieve (1933). "Hawkweed, Wood". A Modern Herbal. botanical.com. Retrieved 2007-12-16.
  10. ↑ Charters, Michael L. "Shaggy Hawkweed". Wildflowers and Other Plants of Southern California. Retrieved 2007-12-26.
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